<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avarar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
    data() {
        return {
            //登录表单数据对象
            loginForm: {
                username:'admin',
                password:'123456'
            },
            //表单输入样子
            loginFormRules: {
                //验证用户名是否合法
                username: [
                    { required: true, message: '请输入用户名', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                password: [
                    { required: true, message: '请输入登录密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]

            }
        }
    },
    methods: {
        //点击重置表单数据
        resetLoginForm(){
            
            this.$refs.loginFormRef.resetFields()
        },
        //登录表单验证
        login(){
            this.$refs.loginFormRef.validate(async valid=>{
                if(!valid) return;
                const {data:res} = await this.$http.post("login",this.loginForm);
                if(res.meta.status !== 200) return this.$message.error("登录失败！")
                this.$message.success("登录成功")
                /* 1.登录成功后在sessionStorage保存token
                  1.1项目中除了登录之外的其它api接口，必须要登录之后才能访问
                  1.2 token只应在当前网页打开期间生效，所以将token保存在sessionSrorage中
                2.通过编程时导航跳转到后台主业，路由地址/home */
                window.sessionStorage.setItem("token",res.data.token);
                this.$router.push("/home");
            })
        }
    }
};
</script>

<style lang="less" scoped>
// scoped表示只在当前组件内生效
.login_container {
  position: relative;
  height: 100%;
  background-color: #2b4b6b;
}
.login_box {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  .avarar_box {
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    box-shadow: 0 0 10px #ddd;
    padding: 10px;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
  .login_form {
      width: 100%;
      position: absolute;
      bottom: 0;
      box-sizing: border-box;
      padding: 0 20px;

      .btns {
      display: flex;
      justify-content: flex-end;
  }
  }
  
}
</style>